Error Report

Cannot complete the install because one or more required items could not be found.
Software being installed: Xtext Complete SDK 2.18.0.v20190603-1516 (org.eclipse.xtext.sdk.feature.group 2.18.0.v20190603-1516)
Missing requirement: Xtext Complete SDK 2.18.0.v20190603-1516 (org.eclipse.xtext.sdk.feature.group 2.18.0.v20190603-1516) requires 'org.eclipse.equinox.p2.iu; org.eclipse.emf.mwe2.language.sdk.feature.group 2.9.1' but it could not be found